Steam is planning to allow users to hide individual games from others

The update is also set to include additional parental controls.

How to Hide Steam Games in Your Library to Reduce Clutter

How to hide Steam games you're playing and game activity from friends - GameRevolution

Self-Publish On Steam: The Ultimate Guide

Steam Showing Purchase Instead of Play for a Family Share Game : r/Steam

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How to Hide Steam Activity from Friends

There's a way to hide games on the Steam store that you already own elsewhere – Destructoid

Where Are Steam Games Stored and How to Change Their Location - Guiding Tech

Is there a way to hide that you own a game in the steam store? - Arqade